High-Back Cosm Chair



Designed by Studio 7.5

The High-Back Cosm cradles your body while the Auto-Harmonic Tilt instantly responds to your movements. A balance of sculptural form and effortless function, Cosm is where performance meets beauty. And with dipped-in-color, experience it in one hue from top to bottom.

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High-Back Cosm Chair

High-Back Cosm Chair

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Item Number: 100128923

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Item Number: FLC162SFP9898VPRBKS84503
High-Back Cosm Chair


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Packaging Type:
Packaging Dimensions:
26" x 21.75" x 38.5"
Package Weight:
High Back: 43 lbs.
Assembly Required:
Care and Maintenance


With regular care and maintenance, your Herman Miller product will provide many years of superior performance and satisfaction. To maintain quality, please follow the cleaning procedures outlined here.

The instructions for the care and maintenance of Herman Miller products are provided to you as a service. No warranty is implied since results may vary.


Frame, Base, and Standard Armpads

Normal cleaning

Wash surface with a soft cloth soaked in mild detergent and warm water. Rinse thoroughly and dry with a soft cloth. 

Do not use solvents or abrasive kitchen cleaners.

Suspension Material

Normal cleaning

Vacuum fabric as needed using an upholstery attachment. Vacuuming picks up dust and reduces the need for professional cleaning. 

Do not brush fabric or use a vacuum attachment with a rotary brush. Brushing may permanently damage the nap or change the character of the fabric.

Spot Cleaning

Immediately soak up the stain with a soft absorbent cloth.

Do not dry the stain completely or it may set. The longer a stain is allowed to remain on a fabric, the more difficult it is to remove.

Water-based stains such as coffee, soft drinks, fruit juices, or milk

Use a water-based cleaner (specifically made for cleaning fabric) or a solution of mild (alkaline) warm soapy water (not overly soapy) applied with a damp clean cloth or sponge. Work the cleaner into a lather or foam.

Never use hot water; it will set the stain. Avoid scrubbing.

Oil-based stains such as lipstick, grease, or salad dressing

Use a dry cleaning solution applied with a damp clean cloth or sponge. Test the cleaning solution on a small, concealed area first. If there is no spotting, ringing, or damage to the fabric or its dyes, apply the cleaning solution to the soiled area with light, quick strokes. Begin at the outside of the stain and work toward the center, being careful not to over-saturate the fabric.

K2R is also a product that can be used. See product label for complete instructions. Do not over apply water or any liquid solution to fabric. Excessive wetting of the fabric with any liquid solution may result in permanent damage to the material. Do not rub too vigorously or you may damage the nap of the fabric or break fibers. Several light applications are better than one heavy application. Soak up all remaining solution and then use another clean cloth or sponge dipped in cool water to remove any residue. Let fabric dry thoroughly and then vacuum well before using. If the stain resists cleaning, contact a professional cleaner.

Large Areas

If large areas are soiled, contact a professional cleaning firm.

User Adjustments
  High Back
Total Height 45-51.6"
Width 26.7-29.3"
Depth 26.7"
Seat Height 14.8-21.4"
Seat Width 20.5"
Seat Depth 15.9"
Arm Height 7.3-11.7"


0 reviews Be the first to review the High-Back Cosm Chair
4.0 / 5.0
17 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great everyday chair!
I was a bit hesitant to purchase the High Back Cosm Chair (with the adjustable arms) because it was a newly released, expensive chair that didn't have many reviews on it. I am so happy that I made the leap -- this chair is very comfortable to sit in for any amount of time. (For reference I am F, 5'6", ~125 lbs) The lumbar support fits perfectly to the small of my back, and my bum no longer hurts after sitting for long hours. It's 100% worth the price and a beautiful piece to look at.
June 7, 2019
1 month ago
Nice looking but not so comfortable for the price
I recently bought this chair and for the price I think it is not worth it. I happen to have the same problem as other in the previous reviews. I'm 6'1" and the seat depth is really too short. Because of that I keep moving to re-ajust myself in order to fit back in a good position. You also feel like being pushed by the chair into a leaning forward position. The chair has a really nice look, but in the end it's daily usage I found it disappointing.
April 29, 2019
Response from Herman Miller
We're so sorry to hear the Cosm chair didn't work out for you. We recommend contacting the place of purchase to talk through what options might be available.
April 30, 2019
Stephanie S
The Finest Chair I Have Ever Owned
I have been in the contract office furniture industry for many years and have tried many office chairs. I fell in love with the Cosm the first time I saw it. The fit and finish is remarkable and the design in beautiful.
I've been using this chair in my home office for over a month now, and I am even more impressed. All I can say is that it delightfully comfortable, simple, intuitive and responsive. Whether typing or kicking back, this chair is always there for me, in a humble and unassuming way.
March 20, 2019
5 months ago
REview on my Cosmo High back chair
This is the third chair that I have purchased and its my least favorite, in fact I really think I hate it. I hate the seat portion which is not long enough to reach my knees and has not adjustments to length it as my previous one did, in fact I have gone back to my previous one because of this. Although I order the arms (butterfly) I don't like them at all …and last but not least the movements with my body is rather stiff but I would guess it because its new ??? and there is no adjustment s
March 11, 2019
4 months ago
Response from Herman Miller
I'm sorry to hear the Cosm Chair isn't working out for you. I will be reaching out to you via email to discuss some options.
March 12, 2019
Lisa F
Wonderful Chair!
I'd like to preface this review by saying that I'm the type of guy who normally thinks it would be cool to write a review, but never actually ends up carving out the time to write one. That being said, this chair was excellent enough to warrant the time to sit down and recommend it.

I also own the Aeron desk chair and know a lot of people are going to be wondering, "Is this a better chair?" Truth be told, they're entirely different chairs. This one is more focused on fitting you when you sit down in it (virtually no adjustments) whereas the Aeron has near infinite adjustability. This chair seems to fit me well and is likely my favorite of the two, but I'd be hard pressed to call it a "better" chair (apples to oranges). For the record, I'm 6'2 and a little over 200lbs and have no problem fitting (although I don't think a smaller person would either).

Thanks Herman Miller!!!
March 6, 2019
I purchased this chair about 2 weeks ago and it arrived last week. I had about 5 days to sit in this chair but for those who do not want to continue reading this review, I've started the return process and I cant wait to send this back.


First of all, I suffer from mid to lower back issue and this chair made my pain level worse and now I am experiencing nerve problems. I cant sit more than an hour in this chair. I tried sitting for about 3 hours but it caused more pain (nerve pinching and etc).

My main issue with this chair is that its too upright. I have to force my self to lean backward and also to maintain that position. It not only forces my back to work even while sitting it is extremely uncomfortable. Also, personally, the leaf arm rest is beautiful but very uncomfortable. Whenever im in an upright position my arms would just slide down making the arm rest useless. However, when I am leaning backward the leaf arm rest works fine.

Another issue that I experienced with this chair is the length of the sit. It's way too short for my leg. Even when I pull my self all the way to the back it only covers half of my thigh (I am 5'10). This definitely puts alot of stress on my back.

This problem persists when working on my computer and simply leaning back and watching netflix.

This chair is too expensive to have these problems. I cant wait to send this back and buy a different chair.

Again, this is my personal experience and it may differ with others experience.

I wish some one had written a detailed review before making this purchase. Now I have to go through the hassle of returning this chair...

I hope this review helps any future buyers with back problems.
March 3, 2019
Response from Herman Miller
I'm sorry to hear the Cosm chair didn't work out for you. If you ever have any questions or concerns please don't hesitate to reach out to us.
March 4, 2019
Lisa F
Everything an office chair could/should be
Exactly what the Review Title says.
March 1, 2019
5 months ago
Not great for light people
I love the comfort of this chair, but as I am on the underweight side it cannot tilt with minimal effort
February 9, 2019
Read this opinion from a real one time, first time buy customer with no experience in buying chairs.
As someone who values design, quality, simplicity, comfort and style it’s hard to find another chair in the market that has everything like the Cosm, in fact I couldn’t find another one. I was hesitant to spend that much on a desk chair for the home office, but the 30 day no questions asked return policy and the amazing customer support when trying to figure out what was the right chair for me helped me to make the decision and I’m glad I did. This chair is everything as advertised, do not think twice invest in your posture, your comfort and your experience. I really can sit in this all day and not feel like it! If your lower back hurts it’s because you’re not sitting in a position that supports it properly. Give it time and it will get better. 12 year warranty, $1200 chair = $100 a year for the best investment I’ve made in a while. Hope this helps other potential buyers make the decision, I will never buy another chair from anyone other than Herman Miller now.
January 17, 2019
Great chair after weeks of breaking in
Cosm chair is definitely an acquired taste. Perhaps because all my previous desk chairs have not been designed as ergonomically as the Cosm, I found the Cosm chair less than comfortable when I first started using it. It almost felt as if the chair was fighting my body and I was very conscious of the chair's impact on my body. However, after about 3 weeks, my body started to accept the fact that there was a proper way to sit and at that point, the benefits of the chair truly set in. Frankly, I don't think it will ever be as comfortable as a chair that allows poor body posture but I do feel that the long term benefit will be worth it.
January 6, 2019
7 months ago

Product Q&A

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Browse 2 questions Browse 2 questions and 2 answers
Can one get adjustable arms with high option in brick colour?
NInaK on Apr 18, 2019
Best Answer: The adjustable arms are only available in graphite, studio white, or carbon.
is high back cosm chair suitable for long hours sit?
Ron S on Jun 22, 2019
Best Answer: The Cosm chair is designed to accommodate a large range of user without having to make many adjustments. It's ideal as a medium term sit ranging from 2-6 hours. Although we have heard that some customers find it so comfortable they sit in it all day.